Legendary porn star Jenna Jameson is accused of stiffing her former lawyers -- and not in a good way.

In a lawsuit filed today in L.A. County Superior Court., Jameson's former divorce team -- Hersh, Mannis, and Bogen L.L.P. -- claims Jenna never forked over $72,312.36 for work dating back to 2006.

In the docs, the lawyers claim they were hired to rep Jenna in her nasty divorce from porn kingpin Jay Grdina -- but after they obeyed her every command ... Jenna left the lawyers high and dry when they demanded a check.

Jenna should know better than anyone ... nobody gives it up for free.